Father and son have a heart-to-heart talk in the bathhouse. The father rubs the child's back, and the camera captures a bit of the buttocks. Later, the child sits up and the camera shows the child's side nudity, followed by a rear-view shot of the child's buttocks. No frontal nudity.
A boy is being bathed by a man, than the man takes him out of the bathtub. The boy is very shy when he was naked in front of his mother. He covers his penis with hands and tells her not to look at it.
Sophie Zhang Xueying has a nude shower scene. She didn't show anything, but it clearly shows that she wears nothing during the scene (not even underwear.)